可重构阵列处理器光电混合互连原型系统实现

高效视频编码（HEVC）标准在提升编码性能的同时,对系统带宽提出了更高的要求。传统电互连方式存在带宽小和时延大的问题,而光互连的高带宽和低功耗为片上资源数据通信提出了新的解决方案。然而由于工艺水平的限制,集成光器件无法在现场可编程门阵列（FPGA）芯片内部实现。采用片外光器件模拟片上光互连系统可以达到原型验证的目的。文章基于BEE4开发平台在单片上采用电互连方式进行数据通信,在Xilinx V6系列芯片间通过接入4通道小型可插拔+（QSFP+）光模块搭建光通信链路,构建光通信网络,实现了光电混合互连网络原型系统。以分辨率176×144的标准测试序列akiyoqcif176×144.yuv为例进行测试,实验结果表明,以光链路替代片间电通信能够正确实现,且板间传输时间仅为电互连的一半,综合频率为51.327 MHz

一种自适应低损耗三维有源光网络结构设计

针对三维有源光网络路径配置时间长、光路由器插入损耗大和网络硬件开销高等问题,文章设计了自适应路由算法和无阻塞、低损耗光路由器。自适应路由算法利用XYZ确定路由算法进行端口的初次判断,再根据端口阻塞情况进行二次判断,最终选择无阻塞和距离短的端口作为节点输出端口;针对三维通信需求分别设计层内6端口和层间3端口光路由器代替7端口光路由器。实验结果表明,利用自适应路由算法进行路由计算时,路径建立过程延迟小、阻塞低,光路由器所需波导和微环谐振器数量少、插入损耗低,平均插入损耗仅为0.88 dB,光网络硬件开销低

Comparison of Benthic Macrofauna Communities between Kandelia obovata Mangrove and Spartina alterniflora Marsh in the Intertidal Zone of Ximen Island in Autumn

为了探讨潮间带密秋茄树生境（树冠覆盖率高于90％）、疏秋茄树生境（树冠覆盖率低于50％）和互花米草生境之间大型底栖动物群落的差异性，2015年11月在浙江西门岛潮间带的秋茄树和互花米草生境进行了大型底栖动物定量取样．结果表明：密秋茄树和疏秋茄树生境大型底栖动物群落的物种数、生物量、多样性指数（H’）、均匀度指数（J）、丰度指数（d）和多变量海洋底栖生物指数（M-AMBI）高于互花米草生境，而秋茄树生境的大型底栖动物群落的栖息密度和海洋底栖生物指数（AMBI）低于互花米草生境．单变量单因素方差分析表明：3种生境之间大型底栖动物生物量差异有统计学意义，这与黑口滨螺（Littoraria melanostoma）的生物量有关．在密秋茄树生境未采集到黑口滨螺，在疏秋茄树生境黑口滨螺生物量低，而在互花米草生境有较高的生物量．此外，密秋茄树和疏秋茄树生境的可口革囊星虫（Phascolosoma arcuatum）、短拟沼螺（Assiminea brevicula）和光滑河蓝蛤（Potamocorbula laevis）的平均栖息密度和生物量均高于互花米草生境的，但密秋茄树和疏秋茄树生境的日本稚齿虫（Prionospio japonica）、沙蚕（Nereis sp．）和黑口滨螺的平均栖息密度和生物量则低于互花米草的．疏秋茄树生境的珠带拟蟹守螺（Cerithidea cingulata）栖息密度和生物量高于密秋茄树和互花米草生境的．上述结果证实潮间带存在大型底栖动物群落的多样性．The quantitative investigation was conducted on November 2015 in Zhejiang Ximen Island in- tertidal zone to compare benthic macrofaunal communities among the dense Kandelia obovata forest （the canopy coverage is more than 90%）,the sparse Kandelia obovata forest （the canopy coverage is less than 50% ） and the Spartina alterniflora marsh. The results showed that the species number, bio- mass,diversity index （H＇ ）, evenness index （J）, abundance index （d） and multivariate marine biotic index （M-AMBI） of benthic maerofauna communities both in the dense and sparse Kandelia obovata forests were all higher than those in the Spartina alterniflora marsh, while the density and marine bi- otic index （AMBI） of benthic macrofauna communities were lower than those in the Spartina alterni- flora marsh. One-way ANOVA showed that there were significantly differences of benthic macrofauna biomass among three habitats,which was related to the biomass of Littoraria melanostoma.Littoraria melanostoma was not found in the dense Kandelia obovata forest and the biomass of Littoraria mela- nostoma was low in the sparse Kandelia obovata forest and high in the Spartina alterniflora marsh. Moreover,the average density and biomass of Phascolosoma esculenta ,Assiminea brevicula and Pota- mocorbula laevis both in the dense and sparse Kandelia obovata forest were higher than those in the Spartina alterniflora marsh.The average densities and biomass of Prionospio japonica ,Nereis sp. and Littoraria melanostoma in the dense and sparse Kandelia obovata forest were lower than those in the Spartina alterniflora marsh.It is obvious that there are significantly differences of benthic macrofaunal communities among three habitats.Cerithidea cingulata and Assiminea brevicula are not in favor of the dense Kandelia obovata and the Spartina alterniflora habitats.国家自然科学基金面上项目（41376113）;海洋公益项目（201305030-6

果蠅血管收縮素轉化酵素相關基因表現受tinman 基因直接調控

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